Dear {Recipient},

Thank you for being part of {organization}'s {title of seminar}. We hope that you found the presentations informative and had an enjoyable experience.

Looking forward to seeing you again next time.

Sincerely,
{Your Name}

Dear {Supporter},

Thank you for supporting {campaign} for the past {number of} {months/years}. Not everyone would spend their spare time {what they do to support the campaign}, and we are extremely grateful for your {efforts/contributions/hard work}.

{Campaign} would not have grown into the successful operation it is today without your help. We would not have been able to {goal that was achieved} or {another goal that was achieved} without your help.

Thank you for being a part of {organization/campaign} and joining us in {carrying out mission}!

Sincerely,
{Your Name}

Dear {Boss},

Thank you so much for the recent bonus! It feels great to know that my hard work is being recognized. Your generous gesture motivates me to always do my best.

Sincerely,
{Your Name}